Quaternary pyridiniumazoleazo dyestuffs

ABSTRACT

AZO DYESTUFFS OF THE FORMULA   (A-N=N-D-)-PYRIDINE; 1-R1,(A-N=N-D-)-PYRIDINIUM X(-)   IN WHICH A REPRESENTS THE RESIDUE OF A COUPLING COMPONENT FREE FROM SULPHONIC ACID AND CARBOXYLIC ACID GROUPS, D REPRESENTS THE RESIDUE OF A FIVE-MEMBERED HETEROCYCLIC RING WHICH CONTAINS THE PYRIDINE RESIDUE BOUND DIRECTLY TO A CARBON ATOM OF THE RING, R REPRESENTS AN ALKYL, ARALKYL OR CYCLOALKYL RESIDUE, X REPRESENTS AN ANION AND N STANDS FOR 1 OR 2. THE DYESTUFFS ARE SUITABLE FOR DYEING AND PRINTING SYNTHETIC FIBRES, WHICH PRODUCE INTENSE AND LEVEL DYEINGS AND PRINTINGS POSSESSING GOOD FASTNESS PROPERTIES SUCH AS GOOD FASTNESS TO LIGHT, WASHING, PERSPIRATION AND SUBLIMATION, AND WHICH DISPLAY GOOD STABILITY IN A WIDE PH RANGE.

United States Patent 3,0 1/ 8 Int. Cl. C09b 29/06, 29/08, 29/22 US. Cl. 260-156 Claims 10 ABSTRACT OF THE DISCLOSURE Azo dyestuffs of the formula DN=NA x-l-l in which A represents the residue of a coupling component free from sulphonic acid and carboxylic acid groups, D represents the residue of a five-membered heterocyclic ring which contains the pyridine residue bound directly to a carbon atom of the ring, R represents an alkyl, aralkyl or cycloalkyl residue, X represents an anion and n stands for 1 or 2. The dyestuffs are suitable for dyeing and printing synthetic fibres, which produce intense and level dyeings and printings possessing good fastness properties such as good fastness to light, washing, perspiration and sublimation, and which display good stability in a wide pH range.

in which A represents the residue of a coupling component free from sulphonic acid and carboxylic acid groups, D represents the residue of a five-membered heterocyclic ring which contains the pyridine residue bound directly to a carbon atom of the ring, R represents an alkyl, aralkyl or cycloalkyl residue, X represents an anion and it stands for 1 or 2. The residue D preferably contains a nitrogen atom and at least one other hetero atom.

A more particularly represents a coupling component of the benzene or naphthalene series free from sulfonic acid and carboxylic acid groups, D is a thiazole, thiadiazole or triazole radical and R is lower alkyl, benzyl or cyclohexyl. Further in the above Formula D represents a 1,2,4-thiadiazole radical bound to the pyridine ring in 3-position and to the azo group in S-position, or a 1,3,4- thiadiazole radical bound to the pyridine ring in 2-position and to the azo group in S-position, or a 1,2,4-triazole-radical bound to the pyridine ring in 3-position and to the azo group in S-position.

ice

In accordance with the invention, the new dyestuffs may be manufactured by coupling or quaternation.

Manufacture by coupling is effected by coupling a diazotized heterocyclic amine which contains a pyridine ring which may be quaternated and is bound directly to a carbon atom, preferably a diazotized amine of the formula in which D, R, X and n have the meanings given above, with any desired coupling component that is free from sulphonic acid and carboxyl groups.

Manufacture by quaternation is effected by treating the corresponding dyestuffs which contain a non-quaternated pyridine residue with quaternating agents, for example, dyestuifs of Formula 1, in which It stands for 1 and A and D have the meanings given above, are reacted with compounds of the formula RX, in which X and R have the meanings given above.

The amines used as starting materials in the manufacture of the new azo dyestuffs by coupling are also new and form part of the invention. They may be prepared by methods known per se, especially by ring formation and, if desired, subsequent quaternation. Pyridine-2-, -3- or -4-carboxylic acid derivatives, which may be formed intermediately during the reaction, and which are capable of forming a heterocyclic ring, especially a five-membered ring are converted into the corresponding heterocycles by cleavage of a multiple bond by elimination, for example, of water (condensation) or ammonia. For example, a pyridine-carboxylic acid amidine may be reacted with thiocyanogen or a pyridinecarboxylic acid halogenoamidine may be reacted with a thiocyanate via the intermediate formation of a pyridine carboxylic acid thiocyanmidine to form a 1,2,4-thiadiazole derivative, in accordance with the following reaction pattern (cf. German patent specification No. 842,346):

it B-NH.

reaction pattern (cf. German patent specification No. 1,067,440; Hoggarth, J. Chem. Soc. 1949, 1163):

The principal examples of such diazo components are aminothiazoles, aminothiadiazoles and aminotriazoles, for example, the following: -amino-3-(2-, 3'- or 4'-pyridyl)- 1,2,4-thiadiazole, 2-amino-5-(2'-, 3'- or 4'-pyridy1)-1,3,4- thiadiazole and 3-amino-5-(2'-, 3'- or 4'-pyridyl)-1,2,4- triazole.

Any desired coupling component may be used, for example, a coupling component of the benzene, naphthalene or heterocyclic series. Coupling components of the benzene series that may be mentioned in addition to the phenols, for example, para-cresol, are, in particular, the aminobenzenes for example,

aniline, 3-methylaniline, 2-methoxy-S-methylaniline, 3-acetylamino-l-aminobenzene,

N-methylaniline,

N-B-hydroxyethylaniline, N-B-methoxyethylaniline, N-B-cyanoethylaniline, N-fi-chloroethylaniline,

dimethylaniline,

diethylaniline,

N-methyl-N-benzylaniline, N-n-butyl-N-fl-chloroethylaniline, N-methyl-N-B-cyanoethylaniline, N-methyl-N-B-hydroxyethylaniline, N-ethyl-N-B-chloroethylaniline, N-methyl-N-fi-acetoxyethylaniline, N-ethyl-N-p-methoxyethylaniline, N-p-cyanoethyl-N-B-chloroethylaniline, N-cyanoethyl-N-acetoxyethylaniline, N,N-di-a-hydroxyethylaniline, N,N-di-B-acetoxyethylaniline, N-ethyl-N-2-hydroxy-3-chloropropylaniline, N,N-di-fl-cyanoethylaniline, N,N-di- 8-cyanoethyl-3-methylaniline, N43-cyanoethyl-N-,B"-hydroxyethyl-S-chloroaniline, N,N-di-fi-cyanoethyl-3-methoxyaniline, N,N-dimethyl-3-acetylaminoaniline, N-ethyl-N-fi-cyanoethyl-El-acetylaminoaniline, N,N-di-p-cyanoethyl-Z-methoxy-S-acetylaminoaniline, N-methyl-N-phenacylaniline, N-B-cyanoethyl-Z-chloroaniline, N,N-diethyl-3-trifluoromethylaniline, N-ethyl-N-phenylaniline,

diphenylamine,

N-methyldiphenylamine, N-methyl-4-ethoxydiphenylamine or N-phenylmorpholine.

4 These compounds may be represented as follows:

I R1 NHCOR.

in which represents a hydrogen atom or an alkyl or C alkoxy group,

represents a cyanoalkoxyalkyl group,

represents a hydrogen atom, a cyanoalkoxyalkyl group or an acyloxyal'kyl group and represents a hydrogen atom, an alkyl, cycloalkyl or alkoxy group that may be substituted or a benzene residue, and especially those of the formula l omomo omomoN I 01110250 cmomoN NH0 0 R4 in which R] and R2" have the meanings given above.

Specially valuable results may also be obtained with coupling components of the formulae has the meaning given above X represents an acylamino group, and in which alkyl represents, for example, a methyl, ethyl or propyl group.

The following coupling components are given as examples:

OCH;

l Q-rr-wmomo CHzCH CN),

l NHCO CH:

7 0111, Q-Momcmo ornament NHCHO /C HZCHQO CH2CH2CN CHflCHiOCOCH: NH0 0 om Nnom0m0 anion c:

N-COCHa 0 on, Q-Nncmdmo anionic:

NHCOCH;

0 CzHg;

NHCH1CH0 orn'omoN -Nn0mcmo 0 0011 l NBC 0 OH;

OCH;

I NHC do 0211,

NBOO onion,

Coupling components of the naphthalene series that may be mentioned in addition to the naphthols'are aminonaphthylenes and N-lower alkylated, N-benzylated or N- phenylated aminonaphthylenes, for example, 1- or Z-naphthylamine, Z-phenylaminonaphthalene, l-dimcthylaminonaphthalene and Z-ethylaminonaphthalen'e. Heterocycliccoupling components are, for example, the indoles, for

example,

2-methyl-7-chloroindole,

2-methyl-5 fiuoroor S-bromoindole, Z-methyl-S,7-dich1oroindole, Z-phenylindole and l-cyanoethyl-Z,G-dimethylindole,

and also pyrazoles, for example,

l-phenyl-S-aminopyrazole, 3-methylpyrazolone-5, 1-phenyl-3-methylpyrazolone-5, 1,3-dimethylpyrazolone-5, 1-buty1-3-rnethylpyrazolone-5, 1-hydroxyethyl-3-methylpyrazolonc-5, 1-cyanoethyl-3-methylpyrazolone-5,

1- (ortho-chlorophenyl) -3-methylpyrazolone-5 and 3-carbomethoxypyrazolone5 quinolines, for example,

1-methyl-4-hydroxyquinoline-2, N-ethyl-3 hydroxy-lmethyl-1,2,3,4-tetrahydroquinoline;

pyrimidines,'f0r example, barbituric acid, and also 1,3- indanedione, 1,8-naphthindanedione or dimedone.

Coupling components that are also suitable are those containing a. quaternatable or quaternated group, for example, N-methyl-N,Z-dirnethylaminoethylaniline, N,2-(N'- ethyl-N'-phenyl)aminoethylpyridinium chloride, and also compounds of the formulae Compounds that may also he used as coupling components are diazotizable amines, for example, 1-amino-3- methylbenzene, 1-amino-Z-methoxy-S-methylbenzene, 1- aminonaphthalene and so forth. Aminoazo dyestuffs are thus formed that may be diazotized and then coupled with the above-mentioned coupling components to form disazo or polyazo dyestuffs.

Also suitable are bifunctional coupling components, for example, those corresponding to the formulae in which X, Y and Y eachrepresents a hydrogen atom, a trifluoromethyl, alkanesulphonyl, alkyl, alkoxy, aryloxy or arylthio group, a halogen atom or an acylamino group, R R and R each represents a hydrogen atom, an alkyl 7 or a substituted alkyl group, n stands for 1, 2 or 3 and 2' represents a bridging group of the formula- 5 in which B represent a CO, S0; or a low alkylene bridge, X and Y each represents an oxygen or a sulphur atom or a. nitrogen bridge, especially an NH-bridge, or a direct bond, and in which the two symbols X, the two symbols Y and B may be different from one another, R represents a substituted or unsubstituted heterocyclic, aromatic or aliphatic residue, which aliphatic residue may be interrupted by hetero atoms, and p, q and r each stands for l or 2, but the sum of p+q+r must be not less than 4. The following are given as examples of such coupling components which may be coupled on each side with a diazotized amine:

omomcN NC-CH -CH;

N-CH -CHz-O-CO-O-CHzOHz-N (oH3c0o-oH,oH, N N

Hc-?H NHOO- -CONH NC-CHzCHg-NH mnemonic:

NHCOCH2CHC GEN CH1) I Hz 5H: H1),

40 O-CO-CH2COO 41H; z) I 1 1 CH3 45 CH; H30

1 I H 0 NCH o--CH N-Gz p 9T 7" g H H EH3 2): (l a I 1 a O-CO-0 HsCr- I Q ll- 2 5 0C0-NHCH NH-CO-o 1): 5 2): o-cooo-o 2): a alt UU0NH -NIICO- CHzCHz-OCOCH3) The single diazo component may also be replaced by a mixture of two or more of the diazo components in accordance with the invention, and the single coupling component may be replaced by a mixture of two or more of the coupling components in accordance with the invention.

Diazotization of the above-mentioned diazo components may be carried out by known methods, for example, with a mineral acid, especially hydrochloric acid, and sodium nitrite, or, for example, with a solution of nitrosylsulphuric acid in concentrated sulphuric acid.

Coupling may also be carried out in known manner, for example, in a neutral to acid medium, if necessary, in the presence of sodium acetate or a similar buffer which influences the rate of coupling, or a catalyst, for example, pyridine or a salt thereof.

Those new dyestuffs that contain a quaternated pyridinium group may be obtained according to a second variant of the manufacturing process in that the corresponding dyestuffs that contain a non-quaternated pyridine residue are quaternated by treatment with an alkylating agent. The following are examples of alkylating or quaternating agents: esters of strong mineral acids or organic sulphonic acids, for example, dimethyl sulphate and diethyl sulphate, alkyl halides, for example, methyl chloride, methyl bromide or methyl iodide, aralkyl halides, for example, benzyl chloride, esters of low-molecular-weight alkane-sulphonic acids, for example, methyl esters of methane-, ethaneor butane-sulphonic acid and esters of benzene sulphonic acids which may contain additional substituents, for example, methyl-, ethyl-, propylor butyl-esters of benzene sulphonic acid, 2- or 4-methylbenzene sulphonic acid, 4-chlorobenzene sulphonic acid or 3- or 4-nitrobenzene sulphonic acid.

It is expedient to effect alkylation by heating in an inert organic solvent, for example, a hydrocarbon, for example, benzene, toluene or xylene, a halogenated hydrocarbon, for example, carbon tetrachloride, tetrachloroethane, chlorobenzene or ortho-dichlorobenzene, or a nitrohydrocarbon, for example, nitromethane, nitrobenzene or a nitronaphthalene. Anhydrides, acid amides or nitriles may also be used as solvents in the alkylation process, for example, acetic anhydride, dimethylformamide or acetonitrile; dimethylsulphoxide may also be used as solvent. Use may also be made of a large excess of alkylating agent instead of a solvent. In this case, care must be taken to ensure that the mixture does not become unduly heated, because the reaction is highly exothermic. However, in most cases it is generally necessary to apply external heat to the reaction mixture to initiate the reaction, particularly when working in the presence of an organic solvent. In special cases, alkylation may also be carried out in an aqueous medium or with the use of an alcohol, if necessary, in the presence of a small amount of potassium iodide.

The dyestuff salts may be purified, if necessary, by dissolving them in water, any unreacted starting dyestuff being filtered oil as an insoluble residue. The dyestufi may be precipitated from the aqueous solution by the addition of a water-soluble salt, for example, sodium chloride.

The quaternated dyestuffs obtained by the process of the invention preferably contain as anion the residue of a strong acid,,for example, sulphuric acid, or a semi-ester thereof, or the residue of an arylsulphonic acid or a halogen ion. The said anions, which are introduced into the dyestuff molecule in accordance with the invention, may also be replaced by anions of other inorganic acids, for example, phosphoric or sulphuric acid, or by anions of organic acids, for example, formic, lactic or tartaric acid; in some cases it is also possible to use the free bases. The dyestuff salts may also be used in the form of double salts, for example, with halides of elements of Group II of the Periodic Table, especially zinc chloride or cadmium chloride.

Howeverythe quaternated dyestuffs obtained by the process of the invention preferably contain as anion Cl, Br, --I, =SO -SO alkyl, SO -aryl or SO -O- alkyl.

The dyestuffs or dyestuff salts containing a quaternated pyridine residue obtained by the process of the present invention are suitable for dyeing and printing a very wide variety of synthetic fibres, for example, polyvinyl chloride, polyamide and polyurethane fibres, and also fibres made from polyesters of aromatic dicarboxylic acids, for example, polyethylene terephthalate fibres, but especially polyacrylonitrile fibres or polyvinylidene cyanide fibres (Darvan). By polyacrylonitrile fibres is meant principally polymers containing more than 80 percent of acrylonitrile, for example, 80 to 95 percent; they may also contain 5 to percent of vinyl acetate, vinyl pyridine, vinyl chloride, vinylidene chloride, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid esters, and so forth. These products are sold under the following trade names: Acrilan 16 56 (Chemstrand Corporation, Decatur, Ala., U.S.A.), Acrilan 41 (Chemstrand Corporation), Creslan (American Cyanamid Company), Orlon 44 (Du Pont), Crylor HI-I (Soc, Rhodiacta SA, France) Leacril N (Applicazioni Chimice Societa per AZlOIll, Italy), Dynel (Union Carbide Chem. Corp), Exlan (Japanese Exlan Industry Co., Japan), Vonnel (Mitsubishi, Japan), Verel (Tennessee Eastman, U.S.A.), Zefran (Dow Chemicals, U.S.A.), Wolcrylon (Filmfabrik Agfa, Wolfen), Ssaniw (U.S.S.R.), and also Orlon 42, Dralon, Courtelle, and so forth.

The new dyestuffs produce on these fibres, which may also be dyed in admixture with one another, intense and level dyeings possessing good fastness to light and good properties of general fastness, especially good fastness to washing-,perspiration, sublimation, crease-resist finishing, decatizing, hot-pressing, rubbing, carbonizing, water, sea water, dry cleaning, cross-dyeing and solvents. The new dyestuffs of the invention also display, inter alia, good stability in a wide pH range, good affinity in aqueous solutions having different pH values, and good fastness to kierboiling. Furthermore, the new dyestuffs reserve well on wool and other natural polyamide fibres.

The quaternated, water-soluble dyestuffs generally have little sensitivity to electrolytes, and some of them display exceptionally good solubility in water or polar solvents. Dyeing with the quaternated, water-soluble dyestuffs is generally carried out in an aqueous neutral or acid medium at the boil under atmospheric pressure or m a closed vessel at an elevated temperature and under superatmospheric pressure, The ordinary commercial levelling agents have no deleterious effect if used, but they are not necessary.

The said dyestuffs are also highly suitable for threecolour dyeing. Furthermore, by virtue of their stability to hydrolysis, they may'be'used with advantage in hightemperature dyeing and for dyeing in the presence of wool. They may also 'be applied to the fibrous materials by printing processes. In this method of application, a printing paste is used which contains, forexample, the usual printing adjuvants in addition to the dyestuff. The dyestuffs may also be used for the bulk colouration of acrylonitrile polymerization products and other plastic materials, which may be dissolved, the colourations'pro- 10 duced being fast to light and washing. They are also suitable for colouring oil paints and lacquers, and for dyeing cotton, especially 'mordanted cotton, cellulose, regenerated cellulose and paper.

The new dyestuffs manufactured by the process of the invention which are insoluble in water and which contain a pyridine residue having a tertiary nitrogen atom are advantageously used in a finely divided form and in the presence of a dispersing agent, for example, soap, sulphite cellulose waste liquor or a synthetic detergent, or a combination of different, wetting and dispersing agents. Prior to dyeing it is generally advantageous to convert the dyestuff into a dyeing preparation which contains a dispersing agent and the finely divided dyestuff in a form such that a fine dispersion is formed when the preparation is diluted with water. Such dyestuff preparations may be obtained in known manner, for example, by precipitating the dyestuff from sulphuric acid and grinding the suspension so obtained wtih sulphite cellulose waste liquor. They may also be prepared, if desired, by grinding the dyestuff in a highly efficient grinding device in the dry or wet state in the presence or absence of a dispersing agent. These dyestuffs are also suitable for dyeing and printing a very wide variety of man-made fibres, for example, cellulose acetate Ifibres and polyolefine fibres, for example, modified polypropylene, polyacrylonitrile, polyvinyl chloride, polyamide or polyurethane fibres, but especially fibres made from polyesters of aromatic dicglijrboxylic acids, for example, polyethylene terephthalate res.

To obtain stronger dyeings, for example, on polyethylene terephthalate fibres, it is advantageous to add a swelling agent to the dyebath, or to carry out the dyeing process under superatmospheric pressure at a temperature of above C., for example, at C. Suitable swelling agents are aromatic carboxylic acids, for example, benzoic acid or salicylic acid, phenols, for example, ortho, or para-hydroxydiphenyl, aromatic halogenated compounds, for example, chlorobenzene, ortho-dichlorobenzene or trichlorobenzene, phenylmethylcarbinol or diphenyl. When carrying out the dyeing process under superatmospheric pressure it is generally advantageous to render the dyebath slightly acid, for example, by the addition of a weak acid, for example, acetic acid.-

The new dyestuffs containing a non-quaternated pyridine residue are specially suitable for application by the so-called thermofixation process in which the fabric to he dyed is impregnated preferably at a temperature not exceeding 60 C. with an aqueous dispersion of the dyestuff which advantageously contains 1 to 50 percent of urea and a thickening agent, especially sodium alginate and squeezed in the usual manner. The fabric is advantageously squeezed so as to retain 50 to 100 percent of its dry weight of dye-liquor.

To fix the dyestuff, the fabric so impregnated is heated to a temperature above 100 C., for example, to a temperature between and 220 C., preferably after drying, for example, in a current of warm air.

The above-mentioned thermofixation process is specially suitable for dyeing union fabrics made from polyester fibres and cellulosic fibres, especially cotton. In this case, the padding liquor contains, in addition to the dyestuff to be used in accordance with the invention, dyestuffs which are suitable for dyeing cotton, for example, direct dyestuffs or vat dyestuffs, or especially the socalled reactive dyestuffs, that is to say, dyestuffs that can be fixed on the cellulosic fibre with formation of a chemical-bond, for example, dyestuffs which contain a chlorotriazine or a chlorodiazine residue. In the latter case, it is advantageous to add an agent capable of binding acid to the padding solution, for example, an alkali metal carbonate or an alkali metal phosphate or an alkali metal borate or perborate, or a mixture thereof. When using vat dyestuffs, the padded fabric has to be treated after the heat treatment with an aqueous alkaline solution of one of the reducing agents commonly used in vat dyeing.

The dyeings produced on polyester fibres by the said processes are advantageously subjected to an after-treatment, for example, by heating with an aqueous solution of a non-ionic detergent.

The said dyestuffs are also suitable for dyeing union fabrics made from polyester fibre and wool; the wool portion of the fabric is reserved and can subsequently be dyed with a wool dyestuff.

The dyestuffs may also be applied by printing processes. In this method of application a printing paste, for example, is used which contains the finely dispersed dyestulf, if necessary, in admixture with one of the abovementioned cotton dyestuffs, as well as the adjuvants normally used in printing, for example, wetting and thickening agents, if necessary, in the presence of urea and/or an agent capable of binding acid.

The above-described processes produce strong dyeings and prints possessing excellent properties of fastness, especlally good fastness to light, sublimation, decatizing, washmg and chlorinated water. A further advantage of the new dyestuffs is that they reserve well on wool and cotton, are stable during drying and show little tendency to deteriorate during prolonged boiling in the presence of wool.

The following examples illustrate the invention, the parts and percentages being by weight unless otherwise stated.

EXAMPLE 1 A mixture is prepared comprising 85 parts by volume of N nitrosylsulphuric acid and 90 parts by volume of a mixture of propionic acid and glacial acetic acid (ratio 1:6). A solution of 14.25 parts of 5-amino-3-(3-pyridyl)- 1,2,4-thiadiazole in 90 parts of the above-mentioned mixture of propionic acid and glacial acetic acid is added at to C. and the batch is stirred for 4 hours in an ice bath. 3 parts of urea are added, the batch is stirred for a further hour and then the diazo solution is run into a solution of 12.8 parts of N-methyl-N,2-cyanoethylaniline in 200 parts of glacial acetic acid. 800 parts of icewater are added and the free mineral acid is neutralized by the addition of sodium acetate to a pH value of 4. A further 800 parts of water are added, the batch is heated to 50 C., and the dyestulf of the formula III I II

1 2-methylindole-...

2 Dlphenylamine ed.

3 2-naphthylamine. 4. Dirnethylarnlne Violet. 5 N ,N-blscyanoethyl-l,3-toluidlne Scarlet. 6 N,N-biscyanoethylaniline Do.

Preparation of 5-amino-3-(3'-pyridyl)-1,2,4-thiadiazole A sodium hypobromite solution prepared from 170 parts by volume of 30% sodium hydroxide solution, 270 parts of water and 134 parts of bromine is added at 0 to 5 C.

to a solution of 120 parts of the amidine hydrochloride of the formula (prepared according to the method described by Shaefer and Peters, J. Org. Chem. 26, 412 [1961]) in 600 parts of water. The N-bromoamidine which precipitates is isolated by suction filtration, washed with water and dried at 40 C. It is dissolved in 250 parts of methanol and then a solution of 60 parts of sodium thiocyanate in 185 parts of methanol is added at a temperature below 20 C. The crystal slurry which forms is heated to about 50 C., is allowed to cool to room temperature and is then filtered and dried.

The corresponding 5-amino-3-(2'-pyridyl)-1,2,4thiadiazole may be obtained in an analogous manner from pyridine-Z-carbonamidine, and the corresponding 5-amino-3- (4-pyridyl)-1,2,4-thiadiazole may be obtained from pyridine-4-carbonamidine.

EXAMPLE 2 3.56 parts of 2-amino-5-(2'-pyridy1)-1,3,4-thiadiazole are dissolved in 20 parts of a mixture of propionic acid and glacial acetic acid (ratio 1:6), and the solution so obtained is added dropwise at 0 C., while stirring, to a mixture of 22 parts by volume of N nitrosylsulphuric acid and 20 parts of the above-mentioned mixture of propionic acid and glacial acetic acid. The batch is stirred for 3 hours at 0 to 5C., 2 parts of urea are added and, after a further 30 minutes, a solution of 3.2 parts of N-methyl- N,2-cyanoethylaniline in 20 parts of glacial acetic acid is added. The solution so obtained is discharged into 0 parts of ice-water and the pH of the violet solution is adjusted to 3 to 4 by the addition of parts of sodium acetate crystals. The dyestuff of the formula CHrCHaCN Preparation of 2-amino-5-(2-pyridyl)-1,3,4-thiadiazole 27.2 parts of pyridine-Z-carboxylic acid imidomethylether [prepared according to the method described by Shaefer and Peters, J. Org. Chem. 26, 412 (1961)] are dissolved in 150 parts of pyridine and then 28 parts of thiosemicarbazide hydrochloride are added. The batch is heated for 3 hours at C. while stirring, the solution is filtered while still warm; and 100 parts of pyridine in the filtrate are evaporated in vacuo. 200 parts of cold water are added to the residue, and the 2-amino-5-(2'- pyridyl)-1,3,4-thiadiazole which precipitates after some time in the form of crystals is isolated by suction filtration and dried.

EXAMPLE 3 16.1 parts of 3-amino-5-(3-pyridyl)-l,2,4-triazole are dissolved in 100 parts of 4 N hydrochloric acid and diazotized at 0 C. by the addition of 25 parts by volume of a 4 N sodium nitrite solution in water. A solution of 15 parts of N,N-diethylaniline in 100 parts of N hydrochloric acid is added to the diazo solution and the coupling mixture is rendered neutral to Congo paper by the addition of sodium acetate. The dyestufi which precipitates is isolated by suction filtration, washed with water and dried. It dyes polyester fibres a fast orange shade.

The 3-amino-5-(3'-pyridyl)-1,2,4-triazole is obtained from nicotinylaminoguanidine (prepared by reacting nicofinic acid v s s so wi h".Swthxfisetfisw r bx. r acting nicotinic acid chloride with aminoguanidine) by' splitting otf waterby heating "to"2'60 "to270" C. Colour-" less crystals melting at 235 to 236 C. are formed.

Further dyestuffs which dye polyester fibres the shades 14 listed in column IV of the following table may be obtai ned by the processes described in Examples 1 to' 3 by diazotizingthe diazo components listed in column II and coupling them with the coupling components listed in 5 column III.

III IV 1 CzHs Ruby.

Q CZH4OH N H H N C-NH:

2 Same asabove Violet.

NHOOCHI 3 do C Hn Red.

C2 4Cl 4.. I 7 2 5 Ruby.

C2H4OOH3 5 Violet 6 ..do Red.

@Nwmm 7 ..d0 Yellow.

i OH;

-- Red,

q dn OCH: Y Violet.

C2H4OCOCHz cmioczHtoN NHCOOCfia l0 do w Red.

" fin :(IL YencwI Y Ho-d 12..-..r.:::: 211's Ruby.

C-N it ("1 NH z C2H4QCOCHB N S (EH: H 1

n fln H Yellow.

14 Y (in 0 CH; Violet.

Nnczmoozmcn l IHC OCHzOH TABLE-Cn1tinmed I II III IV do /CO\ Yellow.

16 d0 H(I'l)([.'|1CH D0.

HOC N III 0 H:

' 17 ..d0 02H; Scarletl CzH CN EF II (Cz 4C )2 N C-NH:

CH3 7 S 19 .do Violet.

20 do (EH; Orange.

CH3 N i H OCH! 21 (32H; Red.

u N C CN I CZHQCN 22 ..do Violet.

21 n 02H; Ruby.-

l CzH4CN NHCOCH' 24 do 0H, 1 Violet.

25 ..d0 /C;H CN Red.

(3111 0 CzHACN 26 s cm Red.

5? Q-x NN CzH4CN 27 ..do I Scarlet:

-N (C2H4C N) a 23 Violet.

29 ..do Yellow.

01 CH3H 30 .do C 0\ D0.

Red:

Vloletl 33 SIS-15:13.2 -(10.....'.".'.

Ruby.

Red.

z z 4 J T n Yellovi.

Red.-

Orange;

Greenlsh yellow.

Orange.

Yellow:

Oranga.

Yellow:

Red.

Yellow;

m R T. m tr I m H t a e w m m C C N m PIL M m I W H a 4 N 0 N s O and the dyestuif is precipitated by the addition of a solu- 20 tion of 20 grams of zinc chloride in 100 parts by volume 8.9 parts of 5-amino-3-(3'-pyridyl)-1,2,4 -thiadiazo1e are diazotized as described in Example 1, and the diazo EXAMPLE 4 of a 30% sodium chloride solution. It dyes polyacrylonitrile fibres a fast brilliant red shade. solution is run into a solution of 14.5 parts of N,2 -(N'- The following table lists in column II further cationic phenyl-N'-butyl)-aminoethylpyridinium chloride in 100 dyestuffs thatdye polyacrylonitrile fibres the shades inparts of water and 100 parts of ice. The batch is diluted 25 dicated column III and that may be obtained by with 1,000 parts of water, rendered neutral to Congored 3 coupling in accordance with the procedures described in by the addition of 250 parts of sodium acetate crystals,

Examples 1 to 4.

III

m m m. n B R r r v C Q m n a. m "m m m C C C C v r N N M N. ,7 N C N C C N C N A N N n I n E u z u I n I m m 1 2 Ruby:

Yellow;

-t It Reddlsh yellow TABLE Cominrued Scarlet.

I]Ilfil 04H! -C C-N=NN GHa-CHI N s CaH4;I:I H CHr-CH:

EXAMPLE 100 parts of dimethylformamide and parts of para- 3 parts of the dyestuff of Example 1, 30 parts of dimethyl formamide and 2 parts of dimethyl sulphate are stirred for one hour at 80 (3., the dyestuff solution so toluene-sulphonic acid methylester are stirred at 80 to 90 C. until starting material is no longer detectable in a thinlayer chromatogram carried out with a test sample. Most obtained is ured into a mixture of 400 parts of water 5 f the sqlvent is rigmoved in vacuo and t resifiue and 4 parts glacial acetic acid, and the dyestulf of the fhluted with a solutlon of 10 grams glacial acetlc acld formula in 500 parts of water. grams of 21116 chloride and 60 parts of sodium chloride are added and the dyestufi of C N CH3 the formula ii 3N=N-N 10 N s CHaCHzCN or- (BH 1 c--- N OH is precipitated fromthe clear red solution by the addition a e a of 40 parts of sodium chloride. It dyes polyacrylonitrile"' y fibres a bluish red shade possessing excellent fastness to Ni N 05 0M light. Zfiblr CH; H

Dyestuffs having similar properties may be obtained by replacing the dimethyl sulphate with diethyl sulphate, 20 benzyl chloride or para-toluene sulphonic acid butylester as quaternating agents and proceeding as described in Example 5.

EXAMPLE 6 precipitates from the solution. It dyes polyacrylonitrile f th f 1 fibres a fast reddish yellow shade. parts 0f the 7m dyestufi? 6 a In the following table are listed further dyestuffs that G N CH produce fast shades on polyacrylonitrile fibres as given IL & a in column IV. They are obtained by quaternating the dyestuffs listed in column II with the alkylating agents given ,3,0 in column I11 inacco'rdance with the procedures described H in Examples 5 and 6.

I II I IV 1 N D1met,hy1 sulphate Yellow.

' q I I iN="N CH3 N H a p 2 C :1;.dO.....':::L:::::znznnzzzr. Violet.

* t 3 Toluenesulphonlc acid ethy1ester...'. Red.-

i -i /("3N=N--N(C=H4CN) N S Ha Dlmethyl sulphate..::..:::::::::::::-:. Red.- 4 ew N CN=NN(C2H4CN)2 N s 5.....-.:;:.:.: Dlethyl snlphate.--..-::::::..::::::: Ruby;

. m- 1: .v CH: C

N l \S/ l CaHaOCOOH:

NHCOGHa TABLECmtimued r v I II III IV Benzylchlon'de Yellow.

Dimethyl sulphate Do.

19 ..d0 Do.

EXAMPLE 7 f s CHaSOF CH3 (prepared by reacting 8.9 parts of 5-arnino 3-(3'-pyridyl) 1,2,4-thiadiaiole with 6 parts of dimethyl sulphate in 50 parts of dimethylformarhide at 50 to 60 C.) are introduced at 0 to 5 C. After stirring for one hour at the temperature indicated, the clear diazo solution is poured into a solution of 8.5 parts of N-methyl-N,2=cyanoethylaniline in 50 parts of 2 N hydrochloric acid and 150 parts of ice. 1,000 parts of water and 250 parts of sodium acetate crystals are added and the dyestulf is; precipitated from the deep red solution by the addition of 60 parts of sodium D C--Nf II it...

'chloride The'dyestutf so obtained j is; identical with the dyestuff' described in Example "5.

lclaimz' l r 1. azo dyestuff'of the'forrnula in which D is l,2,4-thiadiazolylbound to the pyridine ring in 3-'positi'o'n and to the azo group in :S-pdsition, or 1,3,4- thiadiazolyl boundto thepyridine'ring in 2-positionsand to the azo group in 5-position, or 1,2,4-triazolyl bound to the pyridine ring in 3-position and to the azo group in 5-position, R represents C' -alkyl, benzyl or cyclohexyl, X represents an anion, It stands for 1 or 2 and A represents a member selected 'from thegroup consisting of a-group of the formula wherein R is hydrogen, C alkyl, methoxy, chloro or CF R is hydrogen, C alkyl, hydroxyethyl, methoxyethyl, cyanoethoxyethyl, cyanoethyl, chloroe'thyl, benzyl, acetoxyethyl, 2-hydroxy-3-chloropropyl, phenyl, ethoxyphenyl, (pyridiniumch1oride)ethyl, .(pyridiniumbromide) ethyl or (trimethylammoniumchloride)ethyl, R is hydrogen, C alkyl, methoxyethyl, cyanoethyl, hydroxyethyl,

acetoxyethyl or benzyl, R and R together morpholino or piperidino, and R is hydrogen, C alkyl or methoxy; a

is selected from the group consisting of hydrogen, C cyanoalkoxyalkyl, C alkanoyloxyalkyl -or cyanoethyl,

is""selected' from the group consisting of hydrogen, C alkyl, C 2 alkoxy and phenyl; aminonaphthyl, 2.-phenylaminonaphthyl, l-dir'nethylarninonaphthyl, ,2-ethylaminonaphthyl, 2 'methylindolyl, 2,5'-dimethy1ind0lyl, 2,4-dimethyl-,7-methoxyindolyl,,2-phenylor Z-methyl-S-ethoxyindolyl, Z-methyl-S- or 6-chlo'roindolyl," l,2-dimeth y1indolyl, 1-methyl-2-phenylindolyl, 2-methyl-5-nitroindolyl, 2 methyl -"5 cyanoindolyl, 2-methyl-7-chloroindolyl, 2- methyl 5 fluoro' or -5;b'r'omoindolyl, 2-methyI-5,7-dichloroindolyl, 2-phenylii1dolyl, 1-cyanoethyl-2,6-dimethylindolyl; 1-phenyl-5-aminopyrazolyl, S-methylpyrazolonyl- 5, 1-phenyl-3-methylpyrazolonyl-5, 1,3-dimethylpyrazolonyl-5, 1 butyl 3-methylpyrazolonyl-5, .1-hydroxyethyl-3- methylpyrazolonyl-S, l-Cyanoethyl-3-methylpyrazolonyl-5, 1 (ortho-chlorophenyl 3-methylpyrazolonyl-5, 3-carbomethoxypyrazolonyl 5, 1-methyl-4-hydroxyquinolinyl-Z, N ethyl-3-hydroxy-7 methyl-1,2,3,4-tetrahydroquinolinyl, 1,3-indanedionyl, 1,8-naphthindanedionyland dimedonyl.

2. A compound of claim 1 wherein A is a member selected from the group consisting of a group of the formula i l 4 wherein R is hydrogen, C alkyl, methoxy, chloro or CF R is hydrogen, C alkyl, hydroxyethyl, met-boxyethyl, cyanoethoxyethyl, cyanoethyl, chlorocthyl, benzyl, acetoxyethyl, 2-hydroxy-3-chloropropyl, phenyl, ethoxy- 27 phenl, (pyridiniumchloride)ethyl, (pyridiniumbromide) ethyl or (trimethylammoniumchloride)ethyl, R is hydrogen, C alkyl, methoxyethyl, cyanoethyl, hydroxyethyl, acetoxyethyl or benzyl, R and R together morpholino or piperidino, and R is hydrogen, acetylamino, C alkyl or methoxy, or a group of the formula NHCOR;

wherein 1 is selected from the group consisting of hydrogen or C alkoxy,

is C cyanoalkoxyalkyl,

is selected from the group consisting of hydrogen, C cyanoalkoxyalkyl, C alkanoyloxyalkyl or cyanoethyl, and

2 is selected from the group consisting of hydrogen, C alkyl, C alkoxy or phenyl.

3. A compound of claim 1 wherein A is a member selected from the group consisting of a group of the formula 1i ii-N=NN N \S/ mmoN 6. The dyestuif as claimed in claim 1 of the formula N=N- -N r, \S/ Q \C:H4CH

H: V 7. The dyestuif as claimed in claim 1 of the formula raw N s i CH3 g 28 8. The dyestuff as claimed in claim 1 of the formula 9. The dyestuif as claimed in claim 1 of the formula 10. The dyestuff as claimed in claim 1 of the formula N C2HiCN I Hz 01- CzHg 12. The dyestuff as claimed in claim 1 of the formula (II-N 02H: 1i ii-N=NON 1 1 \N/ (E \CZH|CN H a 'c'msor References Cited UNITED STATES PATENTS 2,294,380 9/1942 Braker 260-156 2,857,372 10/ 1958 Straley et a1 260-156 X 2,893,816 7/1959 Tsang et al. 260-156 X 3,082,200 3/1963 Moore et al. 260-156 X 3,458,305 7/1969 Doyle 260-2948 X 3,511,848 5/1970 Bauer et al. 260-296 FOREIGN PATENTS 1,062,245 7/1959 Germany 260-296 OTHER REFERENCES Yoshida et al.; Chem. Abstr., vol. 49, p. 10937 (1955). Atkinson et al.; Chem. Abstr., vol. 49, pp. 15915 to 15917 (1955).

Giuliano et al.; Chem. Abstr., vol. 49, p. 14744 ,(1955).

Hemmerich et al.; Chem. Abstr. vol. 53, pp. 10191- 10192 (1959).

Sadler, Chem. Abstr., vol. 55, p. 19919 (1961).

FLOYD D. HIGEL, Primary Examiner US. Cl. X.R.

260-2948 D, 296 R, 332.2 C, 463, 465 D, 465 E, 472, 485, 570 P 3 33 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 663, 527 Dated May 97 Inventor(s) Gert Hegar It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

F." I W Column 1, line 5, "Ciba Limited" should be CIBA-GEIGY AG Signed and sealed this 2nd day of April l9 7L (SEAL) Attest:

EDWARD PLFLE'I'CHERJR. C. MARSHALL DANN Atte sting Officer Commissioner of Patents aaa 

